24th November 2004 01:07 AM
I need a datasheet
I wanna make an amplifier type AB
Anyone of you can help me please..
What kind of transistor should I use?
I have used BC 637 n BC 638 but i failed
Help me please..
24th November 2004 01:28 PM
Be more specific: need the output power (W), output (speaker) impedance (ohms) and the supply voltage....
26th November 2004 04:30 AM
output speaker: 5W
Originally Posted by Sebi
impedance 8 Ohm
Vcc 12 Volt
Imean the power supply voltage is 12 Volt..
thanks for helping me..
26th November 2004 05:56 AM
You can't get 5W into 8 ohms from 12V, unless you use a speaker coupling transformer, or a bridged amplifier (two amplifiers). Maximum power into 8 ohms off 12V is only about 2W for a normal single ended amplifier.
Originally Posted by riyantoro
28th November 2004 12:12 AM
29th November 2004 02:06 AM
Oh, that's too complex man..
I'm still a beginner.. :P
Well, i'm so sorry coz i wanna make an Amplifier type AB not type A like you mean..
Then, i used a speaker with this specification:
8 Ohm 1/4 Watt, not 5 Watt
I still use 12 volt of Vcc
29th November 2004 03:18 AM
Here is a simple design based around a common LF351 opamp that will drive a small loudspeaker. The transistors act as current boosters for the opamp. The transistors you mention would also work as any other small NPN, PNP pair
The DC gain is 100 with the 3.9nF cap rolling off the gain at higher frequencies. Depending on what your input level will be you may need to have a potentiometer on the input to attenuate high input levels.
29th November 2004 10:19 AM
Some simple? The LM386 from NSC.
29th November 2004 02:04 PM
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